Enron was an American corporation that engaged in a widespread accounting fraud and subsequently failed. Model Tree Structures with Parent References. ObjectId “52c52addead11dc52” , “type”: You should see three files at the highest level: The query used an index for the sorting phase. Model Data to Support Keyword Search. Which of the following statements are true about MongoDB replication.

Use mongorestore to restore the dump into your running mongod. Please download the Enron email dataset enron. In this problem you will update a document in the Enron dataset to illustrate your mastery of updating documents from the shell. The correct result will be: The templates comprise the view.

MongoDB Java

The query did not utilize an index to figure out which documents match the find criteria. Job is already running: Now issue the following command to reload your repository: Model Tree Structures with Nested Sets.

homework 2.2 mongodb java

In this dataset, each document is an email message. Create a Unique Index. ObjectId “52cdde87″”fname”: Indexes are particularly useful where the total size of the documents exceeds the amount of available RAM.


The following statement inserts a document with three jxva into the collection inventory: A typical loop through results looks like the following: This problem is a little tricky because a recipient may appear more than once in the To list for a message. Create a Hashed Index.

MongoDB supports MapReduce and other aggregation tools. Remove Documents that Matches a Condition: There is also a views directory which contains the templates jjava the project.

Modify Multiple Documents with update Method: Model Data to Support Keyword Search.

[Solution] Week 2 : CRUD: MP: MongoDB for Developers

Now it’s your turn to analyze the data set. You can call the cursor variable in the shell to iterate up to 20 times [1] and print the matching documents, as in the following example: Posted by Unknown at Like all Email messages, there is one sender but there can be multiple recipients.

Model Tree Structures with Parent References.

homework 2.2 mongodb java

This operation returns all documents that match the query. Find all exam scores hokework than or equal to 65, and sort those scores from lowest to highest. For reference, the number of email messages from Andrew Fastow to John Lavorato john. Import it into your mongod using the following command from the command line: You have been tasked to cleanup a photosharing database.


It is not an orphan.

MongodbChamps: MJ: MongoDB for Java Developers Homework

The database consists of two collections, albums, and images. To do this, you will need to unwind the To list for each message. Supposed we executed the following Java code. mlngodb

ObjectId “52c52ae8ead11dc54″”hello”: Model Data for Atomic Operations. In this problem, you will be using a collection of student scores that is similar to what we used in the lessons.

ObjectId “52c52ae2ead11dc53″”hello”: Mingodb a List of All Indexes. Model Tree Structures with Child References.

homework 2.2 mongodb java